After several early attempts to fix the issue via firmware updates, Nintendo eventually narrowed the problem down to a hardware issue, advising its customers to avoid placing their Switch consoles "within three to four feet of another wireless device, such as a wireless speaker or a wireless access point."

Nintendo also came up with another, somewhat unorthodox fix involving the application of conductive foam above the controller’s antenna, which supposedly shields it from RF interference. However, customers were required to send their controllers back to Nintendo for this particular fix to be applied.

The filing includes photos of a device that's shaped exactly like one of the Switch's current Joy-Cons, albeit opened up and showing the circuit board that lies within.

Nintendo has yet to comment on its upcoming Joy-Con plans, though if this filing is anything to go by, we can probably expect some new and improved controllers to hit the market in the not-too-distant future.